Preparation and charge transport of polyimide insulating nanocomposite films

In order to clarify the mechanism of space charge formation and distribution in polymeric insulating materials, further experiments on preparation and charge transport of polyimide (PI) nanocomposite films were studied. Polymer nanocomposites were used in electronic and electrical engineering as a result of their excellent properties. In this paper, the TiO₂ nanoparticles modified by employing surface chemical reaction were introduced into the PI matrix by using in situ polymerization. The in situ polymerization process is helpful to drive the nanoparticles into the PI matrix homogeneously. Space charge distribution in pure PI films and the PI/TiO₂ nanocomposite films are measured using the Pulsed Electroacoustic (PEA) method. Two process of space charge measurement were investigated, namely “volts on” and “Decay”. Different types and levels of nanoparticles have been studied to understand the interaction between nanoparticles and polyimide matrix. The addition of nanoparticles has a significant influence on space charge formation, transport and decay process.